package com.gitee.fanx.notes.common;

import java.util.Collection;
import java.util.Map;
import java.util.function.Supplier;

import org.springframework.lang.Nullable;
import org.springframework.util.*;

import com.gitee.fanx.notes.common.exception.ServiceException;

/**
 * 山寨自 {@link org.springframework.util.Assert} <br>
 * 将自定义 message 改为可自定义的异常 {@link ServiceException}
 * <hr>
 *
 * 充分利用【短路模式】进行参数验证, 配合全局异常处理, 统一返回错误结果 <br>
 * 默认为参数校验失败 {@link ResultCode}
 *
 * @author fanx
 */
public abstract class Asserts {

	/** 默认参数错误 */
	private static final ResultCode DEFAULT_CODE = ResultCode.VIOLATION_EXCEPTION;

	/**
	 * Assert a boolean expression, throwing an {@code ServiceException} if the expression
	 * evaluates to {@code false}.
	 * <p>
	 * Call {@link #isTrue} if you wish to throw an {@code ServiceException} on an
	 * assertion failure. <pre class=
	 * "code">Asserts.state(id == null, "The id property must not already be initialized");</pre>
	 * @param expression a boolean expression
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if {@code expression} is {@code false}
	 */
	public static void state(boolean expression, String message) {
		state(expression, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert a boolean expression, throwing an {@code ServiceException} if the expression
	 * evaluates to {@code false}.
	 * <p>
	 * Call {@link #isTrue} if you wish to throw an {@code ServiceException} on an
	 * assertion failure. <pre class="code">
	 * Asserts.state(id == null,
	 *     () -&gt; "ID for " + entity.getName() + " must not already be initialized");
	 * </pre>
	 * @param expression a boolean expression
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if {@code expression} is {@code false}
	 * @since 5.0
	 */
	public static void state(boolean expression, Supplier<? extends ServiceException> ex) {
		if (!expression) {
			throw ex.get();
		}
	}

	/**
	 * Assert a boolean expression, throwing an {@code ServiceException} if the expression
	 * evaluates to {@code false}. <pre class=
	 * "code">Asserts.isTrue(i &gt; 0, "The value must be greater than zero");</pre>
	 * @param expression a boolean expression
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if {@code expression} is {@code false}
	 */
	public static void isTrue(boolean expression, String message) {
		isTrue(expression, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert a boolean expression, throwing an {@code ServiceException} if the expression
	 * evaluates to {@code false}. <pre class="code">
	 * Asserts.isTrue(i &gt; 0, () -&gt; "The value '" + i + "' must be greater than zero");
	 * </pre>
	 * @param expression a boolean expression
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if {@code expression} is {@code false}
	 * @since 5.0
	 */
	public static void isTrue(boolean expression, Supplier<? extends ServiceException> ex) {
		if (!expression) {
			throw ex.get();
		}
	}

	/**
	 * Assert that an object is {@code null}.
	 * <pre class="code">Asserts.isNull(value, "The value must be null");</pre>
	 * @param object the object to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the object is not {@code null}
	 */
	public static void isNull(@Nullable Object object, String message) {
		isNull(object, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that an object is {@code null}. <pre class="code">
	 * Asserts.isNull(value, () -&gt; "The value '" + value + "' must be null");
	 * </pre>
	 * @param object the object to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the object is not {@code null}
	 * @since 5.0
	 */
	public static void isNull(@Nullable Object object, Supplier<? extends ServiceException> ex) {
		if (object != null) {
			throw ex.get();
		}
	}

	/**
	 * Assert that an object is not {@code null}.
	 * <pre class="code">Asserts.notNull(clazz, "The class must not be null");</pre>
	 * @param object the object to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the object is {@code null}
	 */
	public static void notNull(@Nullable Object object, String message) {
		notNull(object, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that an object is not {@code null}. <pre class="code">
	 * Asserts.notNull(clazz, () -&gt; "The class '" + clazz.getName() + "' must not be null");
	 * </pre>
	 * @param object the object to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the object is {@code null}
	 * @since 5.0
	 */
	public static void notNull(@Nullable Object object, Supplier<? extends ServiceException> ex) {
		if (object == null) {
			throw ex.get();
		}
	}

	/**
	 * Assert that the given String is not empty; that is, it must not be {@code null} and
	 * not the empty String.
	 * <pre class="code">Asserts.hasLength(name, "Name must not be empty");</pre>
	 * @param text the String to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the text is empty
	 * @see StringUtils#hasLength
	 */
	public static void hasLength(@Nullable String text, String message) {
		hasLength(text, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that the given String is not empty; that is, it must not be {@code null} and
	 * not the empty String. <pre class="code">
	 * Asserts.hasLength(name, () -&gt; "Name for user '" + user.getId() + "' must not be empty");
	 * </pre>
	 * @param text the String to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the text is empty
	 * @since 5.0
	 * @see StringUtils#hasLength
	 */
	public static void hasLength(@Nullable String text, Supplier<? extends ServiceException> ex) {
		if (!StringUtils.hasLength(text)) {
			throw ex.get();
		}
	}

	/**
	 * Assert that the given String contains valid text content; that is, it must not be
	 * {@code null} and must contain at least one non-whitespace character.
	 * <pre class="code">Asserts.hasText(name, "'name' must not be empty");</pre>
	 * @param text the String to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the text does not contain valid text content
	 * @see StringUtils#hasText
	 */
	public static void hasText(@Nullable String text, String message) {
		hasText(text, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that the given String contains valid text content; that is, it must not be
	 * {@code null} and must contain at least one non-whitespace character.
	 * <pre class="code">
	 * Asserts.hasText(name, () -&gt; "Name for user '" + user.getId() + "' must not be empty");
	 * </pre>
	 * @param text the String to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the text does not contain valid text content
	 * @since 5.0
	 * @see StringUtils#hasText
	 */
	public static void hasText(@Nullable String text, Supplier<? extends ServiceException> ex) {
		if (!StringUtils.hasText(text)) {
			throw ex.get();
		}
	}

	/**
	 * Assert that the given text does not contain the given substring. <pre class=
	 * "code">Asserts.doesNotContain(name, "rod", "Name must not contain 'rod'");</pre>
	 * @param textToSearch the text to search
	 * @param substring the substring to find within the text
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the text contains the substring
	 */
	public static void doesNotContain(@Nullable String textToSearch, String substring, String message) {
		doesNotContain(textToSearch, substring, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that the given text does not contain the given substring. <pre class="code">
	 * Asserts.doesNotContain(name, forbidden, () -&gt; "Name must not contain '" + forbidden + "'");
	 * </pre>
	 * @param textToSearch the text to search
	 * @param substring the substring to find within the text
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the text contains the substring
	 * @since 5.0
	 */
	public static void doesNotContain(@Nullable String textToSearch, String substring,
			Supplier<? extends ServiceException> ex) {
		if (StringUtils.hasLength(textToSearch) && StringUtils.hasLength(substring)
				&& textToSearch.contains(substring)) {
			throw ex.get();
		}
	}

	/**
	 * Assert that an array contains elements; that is, it must not be {@code null} and
	 * must contain at least one element.
	 * <pre class="code">Asserts.notEmpty(array, "The array must contain elements");</pre>
	 * @param array the array to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the object array is {@code null} or contains no
	 * elements
	 */
	public static void notEmpty(@Nullable Object[] array, String message) {
		notEmpty(array, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that an array contains elements; that is, it must not be {@code null} and
	 * must contain at least one element. <pre class="code">
	 * Asserts.notEmpty(array, () -&gt; "The " + arrayType + " array must contain elements");
	 * </pre>
	 * @param array the array to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the object array is {@code null} or contains no
	 * elements
	 * @since 5.0
	 */
	public static void notEmpty(@Nullable Object[] array, Supplier<? extends ServiceException> ex) {
		if (ObjectUtils.isEmpty(array)) {
			throw ex.get();
		}
	}

	/**
	 * Assert that an array contains no {@code null} elements.
	 * <p>
	 * Note: Does not complain if the array is empty! <pre class=
	 * "code">Asserts.noNullElements(array, "The array must contain non-null elements");</pre>
	 * @param array the array to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the object array contains a {@code null} element
	 */
	public static void noNullElements(@Nullable Object[] array, String message) {
		notNull(array, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that an array contains no {@code null} elements.
	 * <p>
	 * Note: Does not complain if the array is empty! <pre class="code">
	 * Asserts.noNullElements(array, () -&gt; "The " + arrayType + " array must contain non-null elements");
	 * </pre>
	 * @param array the array to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the object array contains a {@code null} element
	 * @since 5.0
	 */
	public static void noNullElements(@Nullable Object[] array, Supplier<? extends ServiceException> ex) {
		if (array != null) {
			for (Object element : array) {
				if (element == null) {
					throw ex.get();
				}
			}
		}
	}

	/**
	 * Assert that a collection contains elements; that is, it must not be {@code null}
	 * and must contain at least one element. <pre class=
	 * "code">Asserts.notEmpty(collection, "Collection must contain elements");</pre>
	 * @param collection the collection to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the collection is {@code null} or contains no elements
	 */
	public static void notEmpty(@Nullable Collection<?> collection, String message) {
		notEmpty(collection, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that a collection contains elements; that is, it must not be {@code null}
	 * and must contain at least one element. <pre class="code">
	 * Asserts.notEmpty(collection, () -&gt; "The " + collectionType + " collection must contain elements");
	 * </pre>
	 * @param collection the collection to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the collection is {@code null} or contains no elements
	 * @since 5.0
	 */
	public static void notEmpty(@Nullable Collection<?> collection, Supplier<? extends ServiceException> ex) {
		if (CollectionUtils.isEmpty(collection)) {
			throw ex.get();
		}
	}

	/**
	 * Assert that a Map contains entries; that is, it must not be {@code null} and must
	 * contain at least one entry.
	 * <pre class="code">Asserts.notEmpty(map, "Map must contain entries");</pre>
	 * @param map the map to check
	 * @param message the exception message to use if the assertion fails
	 * @throws ServiceException if the map is {@code null} or contains no entries
	 */
	public static void notEmpty(@Nullable Map<?, ?> map, String message) {
		notEmpty(map, () -> new ServiceException(DEFAULT_CODE, message));
	}

	/**
	 * Assert that a Map contains entries; that is, it must not be {@code null} and must
	 * contain at least one entry. <pre class="code">
	 * Asserts.notEmpty(map, () -&gt; "The " + mapType + " map must contain entries");
	 * </pre>
	 * @param map the map to check
	 * @param ex a supplier for the exception to use if the assertion fails
	 * @throws ServiceException if the map is {@code null} or contains no entries
	 * @since 5.0
	 */
	public static void notEmpty(@Nullable Map<?, ?> map, Supplier<? extends ServiceException> ex) {
		if (CollectionUtils.isEmpty(map)) {
			throw ex.get();
		}
	}

}
